question_answer 1)
Consider the given statements and select the correct option which correctly identifies true (T) and false (F).
(i) When a body is in steady motion on a surface, the force of friction is dynamic friction.
(ii) The force of friction between two bodies always acts parallel to the surface in contact with each other.
(iii) It is easier to push a lawn roller than to pull.
(iv) Limiting friction is greater than sliding friction.
A)
B)
C)
D)
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question_answer 2)
Two objects A and B are moving on rough surface as shown in figure. Object A has greater velocity than B then
A)
A experiences more frictional force than S done
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B)
B experiences more frictional force than A done
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C)
Both experience same frictional force done
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D)
Cannot be said because data is insufficient. done
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question_answer 3)
A box was pushed equal distance on four different surfaces. The force needed for each surface was recorded in the given table.
Surface M N O P Force Needed (N) 670 570 320 500
On which surface was the friction least?
A)
M done
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B)
N done
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C)
O done
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D)
P done
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question_answer 4)
Complete the passage using the suitable words given in option below.
A rough surface will offer a ___(i)___ frictional force than a smooth surface. The heavier the object, the ___(ii)___ will be the frictional force. Friction is a ___(iii)___ force.
A)
B)
C)
D)
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question_answer 5)
Observe the given activity. What do you conclude from this?
A)
The frictional force depends on the nature of the two surfaces in contact. done
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B)
Frictional force increases as mass increases. done
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C)
Rolling friction is less than sliding friction. done
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D)
Frictional force is muscular force. done
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question_answer 6)
Direction: Read the passage carefully and answer the following questions. In the figures shown, there are two jars, one is filled with water and other is empty. There are two balls of plasticine of the same size.
In which jar does the ball reach the bottom first?
A)
In jar filled with water done
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B)
In jar without water done
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C)
In both the jars at the same time done
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D)
Cannot be said because data is insufficient. done
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question_answer 7)
Direction: Read the passage carefully and answer the following questions. In the figures shown, there are two jars, one is filled with water and other is empty. There are two balls of plasticine of the same size.
What do you observe from the given information?
A)
Friction due to air is much smaller than the friction due to liquid. done
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B)
Friction due to air is much greater than the friction due to liquid. done
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C)
Friction due to air is equal to the friction due to liquid. done
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D)
None of these done
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question_answer 8)
Identify the methods of increasing and decreasing friction and choose the correct option.
(i) The tyres of vehicles have treads. (ii) Gymnasts often apply a coarse material on their hands. (iii) Saliva in our mouth helps us to swallow food. (iv) A surgeon powders his hand before pulling on his plastic gloves
A)
B)
C)
D)
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question_answer 9)
In which of the following cases the friction is helpful (H) and troublesome (T)?
(a) Lighting a matchstick
(b) Applying the brakes on a cycle
(c) Use a towel to open tightly closed lid of a bottle
(d) Pulling drawer out of a desk
A)
B)
C)
D)
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question_answer 10)
Read the given statements and select the correct option.
Statement 1: It takes a much longer time and covers more distance to stop a moving ship in water than a moving car with same speed on the road. Statement 2: The friction on water surface is much less than the solid surface.
A)
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done
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B)
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done
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C)
Statement 1 is true but statement 2 is false. done
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D)
Statement 1 is false but statement 2 is true. done
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question_answer 11)
Ram pushes the box by applying a force of 500 N in horizontal direction so that the box starts sliding-along the floor as shown in figure. Find the point where the frictional force acting on the box is maximum.
A)
P done
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B)
Q done
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C)
R done
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D)
P, Q and R done
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question_answer 12)
To every action there is always an equal and opposite reaction. Which of the following statements is correct regarding this?
A)
The buggy pulls the horse backward just as hard as the horse pulls the buggy forward. Both of them would not move forward if surface is frictionless. done
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B)
The horse pulls the buggy forward slightly harder than the buggy pulls the horse backward, so they move forward. done
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C)
The horse can pull the buggy forward only if the horse weighs more than the buggy. done
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D)
None of these done
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question_answer 13)
A man sharpens his knife as shown in the figure. Which of the properties of friction are in use?
(i) Friction helps us to hold objects. (ii) Friction acts in the opposite direction of motion. (iii) Friction causes the surfaces in contact to wear away. (iv) Friction produces heat energy.
A)
(i) and (ii) done
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B)
(i), (iii) and (iv) done
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C)
(iii) and (iv) done
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D)
All (i), (ii), (iii) and (iv) done
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question_answer 14)
John carried out an experiment to find out how different surfaces (P, Q, R and S) affect the distance a car travelling at 50 km/h needed to stop once the brakes are applied. The results are shown below:
Type of road surfaces P Q R S Stopping distance(m) 18 15 19 27
Which type of road will provide the most friction for the car to stop?
A)
P done
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B)
Q done
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C)
R done
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D)
S done
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question_answer 15)
When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it acts
A)
In the backward direction on the front wheel and in the forward direction on the rear wheel done
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B)
In the forward direction on the front wheel and in the backward direction on the rear wheel done
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C)
In the forward direction on both front and the rear wheels done
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D)
None of these. done
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question_answer 16)
When friction is acting in the direction of P, in which direction do you think the force is applied?
A)
P done
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B)
Q done
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C)
R done
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D)
S done
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question_answer 17)
Read the given statements and select the correct option.
Statement 1: While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper. Statement 2: Friction always opposes motion.
A)
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done
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B)
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done
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C)
Statement 1 is true and statement 2 is false. done
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D)
Both statements 1 and 2 are false. done
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question_answer 18)
Consider a vehicle going on a horizontal road towards east. Neglect any force due to air. The frictional force on the vehicle by the road
A)
Is towards east if the vehicle is accelerating done
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B)
Is zero if the vehicle is moving with a uniform velocity done
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C)
Must be towards east done
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D)
Must be towards west. done
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question_answer 19)
A box is given a push across the floor. It comes to stop shortly after. Which one of the following reasons explain why this happen?
A)
Gravity is acting on the box in the direction opposite to the box's movement. done
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B)
Friction is acting on the box in the same direction of the box's movement. done
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C)
Friction is acting on the box in the direction opposite to the box's movement. done
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D)
The heat produced during the box's movement slows down the box. done
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question_answer 20)
When the applied force is doubled on an object and the object is still at rest, then friction becomes
A)
Doubled done
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B)
Halved done
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C)
Quadrupled done
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D)
Zero. done
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